Stephen E.
asked • 04/03/17
Mrs.Naidu bought $155 in groceries she paid her bill with $5 and $20 notes using a total of 13 notes caculate how many of each type of notes were used
Serge M.
answered • 04/04/17
Professor of Accounting, retired. Ph.D., CPA
X + Y = 13
5X + 20Y = 155
Multiply the first equation by 5 and subtract from the second equation
5X + 20Y = 155
5X + 5Y = 13*5 = 65
__________________
0 + 15Y = 90
Y = 90 / 15 = 6
She used 6 $20 bills.
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